7 Tex. Admin. Code § 60.104
A motion for rehearing pursuant to Finance Code § 61.006 must be filed on or before 14 days after the date the decision or order that is the subject of the motion is signed. A copy of the motion for rehearing must be served on all parties who made an appearance or otherwise submitted a filing in the proceeding, and the motion must include a certificate of service reciting the parties served and the method of service. A party must file a reply to the motion for rehearing, if any, on or before 30 days after the date the decision or order that is the subject of the motion is signed. The Commissioner must act on the motion for rehearing on or before 45 days after the date the decision or order that is the subject of the motion is signed or the motion is deemed overruled by operation of law.
7 Tex. Admin. Code § 60.104